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Originally Posted by Dapper Dan
I don't know much about edelbrock carburetors but if it only happens when you "hit it" it sounds to me like the accelerator pump. On Holley carburetors when you punch the gas the venturi effect alone is not enough to meet the demand and the engine stumbles, the pump shot shoots a stream of gas into the carb until it can basically catch up. Google it and see if it sounds like your problem, just a thought hope it helps.
BTW to check it on Holley's you remove the air cleaner look down the throat of the carburetor with the engine off and pull back the throttle shaft, you should see a nice solid stream of gas shoot out into the carburetor.
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Almost all of the edelbrock carbs have a few different holes on the accelerator pump linkage, If you have a good bit of vacuum at idle you can probably lean up that shot enough to fix your problem just by going up one hole on the linkage, I've seen that fix this scenario a few times and it's a free and easy fix if it works.